Weather in Genève for September 2025
In general, the average temperature in Genève at the beginning of September is 25.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.1 °C by the end of September.
Genève experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 152.9 mm.
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Genève in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  26° | 2  25° | 3  25° | 4 25° | 5 26° | 6  27° | 7 27° |
| 8 26° | 9  23° | 10 23° | 11 23° | 12 23° | 13 21° | 14  20° |
| 15 22° | 16 20° | 17 18° | 18 19° | 19 18° | 20 19° | 21 21° |
| 22 19° | 23 19° | 24 20° | 25 20° | 26  18° | 27 18° | 28 17° |
| 29 17° | 30 17° |
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Temperatures trend during September in Genève
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Cloudy | 26° /11° | 1.4 mm | 6 | |
| 2 Sept. | Patchy rain possible | 25° /12° | 3.9 mm | 6 | |
| 3 Sept. | Moderate rain at times | 25° /13° | 11.2 mm | 6 | |
| 4 Sept. | Patchy rain possible | 25° /13° | 3.7 mm | 6 | |
| 5 Sept. | Cloudy | 26° /13° | 1.3 mm | 6 | |
| 6 Sept. | Sunny | 27° /12° | 2.7 mm | 6 | |
| 7 Sept. | Sunny | 27° /13° | 5.4 mm | 7 | |
| 8 Sept. | Sunny | 26° /13° | 9.1 mm | 6 | |
| 9 Sept. | Partly cloudy | 23° /12° | 2.5 mm | 6 | |
| 10 Sept. | Patchy rain possible | 23° /11° | 2 mm | 6 | |
| 11 Sept. | Partly cloudy | 23° /11° | 4.5 mm | 6 | |
| 12 Sept. | Partly cloudy | 23° /9° | 0.6 mm | 6 | |
| 13 Sept. | Partly cloudy | 21° /11° | 2.6 mm | 5 | |
| 14 Sept. | Overcast | 20° /11° | 8.7 mm | 5 | |
| 15 Sept. | Moderate rain at times | 22° /11° | 8.7 mm | 5 | |
| 16 Sept. | Moderate or heavy rain shower | 20° /11° | 6.6 mm | 5 | |
| 17 Sept. | Overcast | 18° /10° | 0.1 mm | 5 | |
| 18 Sept. | Overcast | 19° /9° | 5.9 mm | 5 | |
| 19 Sept. | Patchy rain possible | 18° /7° | 6.8 mm | 4 | |
| 20 Sept. | Moderate rain at times | 19° /7° | 1.9 mm | 5 | |
| 21 Sept. | Partly cloudy | 21° /8° | 2.3 mm | 5 | |
| 22 Sept. | Cloudy | 19° /7° | 4.5 mm | 5 | |
| 23 Sept. | Sunny | 19° /7° | 9.6 mm | 5 | |
| 24 Sept. | Sunny | 20° /7° | 4.3 mm | 5 | |
| 25 Sept. | Partly cloudy | 20° /7° | 4.3 mm | 5 | |
| 26 Sept. | Heavy rain at times | 18° /9° | 14.2 mm | 4 | |
| 27 Sept. | Cloudy | 18° /8° | 5.2 mm | 4 | |
| 28 Sept. | Patchy rain possible | 17° /8° | 12.4 mm | 4 | |
| 29 Sept. | Moderate or heavy rain shower | 17° /8° | 5 mm | 4 | |
| 30 Sept. | Sunny | 17° /7° | 1.4 mm | 5 | |
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Guide for Genève in September
In September, the weather in Genève, Switzerland, experiences a transition from the lingering warmth of summer to the crispness of early autumn. At the beginning of the month, the average temperature hovers around 18°, with pleasant, mild days and cooler evenings.
The city is often still basked in the remnants of summer, making it an ideal time to explore the charming streets and picturesque lakeside.
As the month progresses, the temperatures gradually begin to drop, with the average temperature decreasing to around 15° by the end of September. The weather becomes crisper, and the cityscape starts to showcase the beautiful autumnal colors.
Visitors can enjoy the changing scenery and take part in outdoor activities such as hiking or cycling in the surrounding countryside.
Overall, September in Genève offers a delightful blend of late summer warmth and early autumnal charm, making it an excellent time to visit for those who enjoy milder weather and wish to experience the city during a quieter period.
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Genève in September - FAQ
What to pack to Genève in September?
As you prepare for your trip to Genève in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Genève, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Genève
UV exposure in Genève during September
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Where is Genève?Get accurate weather forecasts for Genève, located at latitude 46.202 and longitude 6.146. Stay updated with localized weather information tailored for Genève.